Return bend fitting



Dec. 17, 1935. F c, FANTZ RETURN'BEND FITTING Filed Oct. 29, 1932 2 Sheets-Sheet 1 FIG. 2.

INVENTOR BY wvd ATTORNEY Dec. 17, 1935. F. c. FANTZ 2,024,347

RETURN BEND FITTING Filed Oct. 29, 1952 2 Sheets-Sheet 2 f INVENTOR Patented Dec. 17, 1935 UNITED STATES PATENT OFFICE 5 Claims.

My invention relates to that class of return bends for use in tube coils or banks in cracking stills and specifically to such as is described in my application for patent, Serial No. 585,220, now Patent No. 1,936,386 of which this is a continua:

.tion in part and which is also covered by my Patited in the tubes during the operation as this is highly dangerous and if not removed is liable to cause a ruptured tube with attendant fire resulting in property damage and possible loss of life.

This is due to the fact that the coke acts as an insulator for the oil so that the metalforming the tube is not cooled by the passage of the oil and when the limit of endurance of the metal is reached a disastrous accident may occur. It was for this reason that the fitting described in by patent was produced.

My present invention has for its object to provide a different form of sectional ring to engage the shoulders upset on the tubes. In my present invention instead of a sectional ring, I employ a plate formed in two parts or halves each half of which is provided with portions having shoulders formed on them which are adapted to be locked to the shoulders formed on the tubes adjacent their ends, means may be provided to secure the two halves together if desired.

My means of accomplishing the foregoing objects may be more readily understood by having reference to the accompanying drawings which are hereunto annexed and made a part hereof, in which Fig. 1 is a side elevation of my improvement, part of the walls of the housing being broken away showing the parts in section;

Fig. 2 is a section in Fig. 1 on the line 2-2 the tubes, being omitted;

Fig. 3 is a fragmentary detail view;

Fig. 4 is a view similar to Fig. 1 showing a slightly diiferent form of plate;

Fig. 5 is a section on the line 55 in Fig. 4; and

Fig. 6 is a fragmentary detail view.

Similar reference numerals refer to similar parts throughout the entire description.

As shown in the drawings the tubes I and 2 are connected by a return bend 3 so as to provide an uninterrupted passageway therethrough. This bend is mounted in. a housing which comprises annular portions 4 and 5 in which the tubes 5 I and 2 are demountably mounted side walls, I, 8, 9 and I extend upwardly from the annular portions 4 and respectively. Toggles or strong backs II are mounted in slots I2 and I3 formed in the upwardly extending side walls. Set screws 10 I4 are mounted in the toggles I I. The inner ends of these set screws I4 engage abutments formed on the external walls of the return bend 3. Preferably the inner walls of the annular portions are provided with shoulders I5 against which shoulders I6 formed on the tube engaging portions of the plate rest. Shoulders 2| are formed on the arcuate surfaces of these portions against which the shoulders I'I, formed by upsetting the tube ends, rest. This plate is preferably made in two halves I8 and I9 which may be fastened together by a bolt 20 though obviously some other form of fastening may be used if desired. The tube engaging portions are preferably formed with extensions 22 and 23. By this construction, 25 instead of having a number of pieces of a section ring for each tube, a half of the plate serves the same purpose. In some instances it may be found desirable to form the plate as shown in Figs. 4 to 6 in which the extensions 22 and 23 are omitted and the plate is just a fiat piece of metal each half of which has a shoulder 2I to engage the shoulders IT on the tubes. I have shown a type of joint for the tubes and the return bend which has been found in practice to be highly satisfactory, obviously any one type of joint may be employed.

From the foregoing description it clearly appears that by tightening the set screws I I against the abutments on the return bend 3 that the annular portions of the housing will draw the ends of the tubes against the return bend and form a leak proof joint.

Having described my invention what I regard as new and desire to secure by Letters Patent is: 1. In a refinery apparatus, a return bend adapted to connect a pair of adjacent still tubes to provide an uninterrupted passageway therethrough, a housing in which said return bend is located, said housing comprising annular portions in which the ends of said tubes are demountably mounted, said tubes being enlarged adjacent their ends to form external shoulders, a spacing plate formed in halves having portions adapted to be locked to the shoulders on the tube and means to hold said parts in assembled relation and form a leak proof joint.

2. In a refinery apparatus, a return bend adapted to connect a pair of adjacent still tubes, to provide an uninterrupted passageway therethrough, a housing in which said return bend is located, said housing comprising annular portions in which the ends of said tubes are demountably mounted, shoulders on the inner walls of said annular portions, said tubes being enlarged adjacent their ends to form external shoulders, a spacing plate formed in halves having portions adapted to be locked to the shoulders on the tube, said tube engaging portions resting on the shoulder on the inner walls of said annular portions, and means to hold said parts in assembled relation and form a leakproof joint.

3. In a refinery apparatus, a return bend adapted to connect a pair of adJacent still tubes to provide an uninterrupted passageway therethrough, a housing in which said return bend is located, said housing comprising annular portions in which the ends of said tubes are demountably mounted, shoulders on the inner walls 01 said annular portions, said tubes being enlarged adjacent their ends to form external shoulders, a spacing plate formed in halves, having portions adapted to be locked to the shoulders on the tube, downwardly depending extensions on the tube engaging portions of said plate, and means to hold said parts in assembled relation and form a leaknroof Joint.

4. In a refinery apparatus, a return bend adapted to connect a pair or adjacent still tubes to provide an uninterrupted passageway therethrough, a housing in which said return bend is located, said housing comprising annular por- 5 tions in which the ends of said tubes are demountably mounted, said tubes being enlarged adjacent their ends to form external shoulders,

a spacing plate formed in halves having portions adapted to be locked to the shoulders on the tube, means to secure said halves together, and means to hold said parts in assembled relation and form a leak proof Joint.

5. In a refinery apparatus, a return bend adapted to connect a pair of adjacent still tubes to provide an uninterrupted passageway therethrough, a housing in which said return bend is located, said housing comprising annular portions in which the ends of said tubes are demountably mounted, shoulders on the inner walls of said annular portions, said tubes being enlarged add acent their ends to form external shoulders, a spacing plate formed in halves having portions adapted to partially encircle a tube and to be locked to the shoulders on the tube, said tube engaging portions resting on the shoulder on the inner walls of said annular portions, and means to hold said parts in assembled relation and form a leakproof joint.

FRED C. FANTZ. 

